Merge pull request 'Data handling improvement' (#1) from data-handling-improvement into master

Reviewed-on: #1

README.md

@@ -1,14 +1,115 @@
+# TODO
+- [x] Read live telemetry (from a live session or replay)
+- [x] Read data from a stored `.ibt` file
+- [x] Allow to export the data to an `.ibt` file
+- [x] Allow to export the session info data to a `.yaml` file
+- [ ] Make sure variables with multiple counts are correctly parsed and stored
+- [ ] Correctly support and implement the bitFields data
+- [ ] Add the message broadcasting system
+- [ ] Explore a more convenient API for fetching the data for the SDK user. Also do some renamings
+- [ ] Change the pattern in which the data is fetched from the telemetry and
+how it is exported into `.ibt` files
+
+
 # About
-This project will be able to parse `.ibt` files, read live data from races and
-broadcast messages to the service. Its still not very mature at all, but after
-this commit I will turn it into a package instead and give it a stable API.
-Will also put some examples then.
+This project is a simple Go SDK for the popular iRacing racing simulator.
+It has the capabilites to:
+- Read live data (live session or replay)
+- Read data from a `.ibt` telemetry file
+
+It should run on Linux, MacOS and Windows. With the caveat that live sessions
+only happen on Windows (that I know about), therefore Linux and MacOS can only
+read data from telemetry files.
 
 
-## The SDK
-I used various sources to develop and understand how `iRacing` works, and learn
-a lot with it. Once I have matured this project a bit I will document its
-inner workings too.
+## Usage
+The SDK instance is created by calling `goirsdk.Init(Reader, exportTelem, exportYAML)`
+- `Reader` is a variable that implements the interface:
+```go
+type Reader interface {
+	io.Reader
+	io.ReaderAt
+	io.ReadCloser
+}
+```
+To read data from a `.ibt` file, the user should pass the `*os.File` of it, and
+to read live telemetry the user should pass nil
+
+- `exportTelem` should be an empty string if the user doesn't want to export
+the data, otherwise pass a string with the path for the destination telemetry
+file
+
+- `exportYAML` is just like the exportTelem but for the session info `yaml` data
+
+### Example
+```go
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"time"
+
+	"github.com/ESilva15/goirsdk"
+)
+
+func msToKph(v float32) int {
+	return int((3600 * v) / 1000)
+}
+
+func main() {
+	// Open the data source file
+	file, err := os.Open("/path/to/ibtFile")
+	if err != nil {
+		log.Fatalf("Failed to open IBT file: %v", err)
+	}
+
+	// Instantiate our iRacing SDK instance
+	irsdk, err := goirsdk.Init(file, "", "")
+	if err != nil {
+		log.Fatalf("Failed to create iRacing interface: %v", err)
+	}
+	defer irsdk.Close()
+
+	// Set up a loop to iterate our data
+	mainLoopTicker := time.NewTicker(time.Second / 60)
+	defer mainLoopTicker.Stop()
+
+	for {
+		// Update the data that the SDK is holding with the next tick
+		_, err := irsdk.Update(100 * time.Millisecond)
+		if err != nil {
+			log.Printf("could not update data: %v", err)
+			continue
+		}
+
+		// Vehicle Movement data gathered from the names we can find on the
+		// telemetry_docs.pdf file
+		// - I wish to make this less verbose if possible
+		if _, ok := irsdk.Vars.Vars["Gear"]; !ok {
+			log.Fatal("Field `Gear` doesn't exist")
+		}
+
+		if _, ok := irsdk.Vars.Vars["RPM"]; !ok {
+			log.Fatal("Field `RPM` doesn't exist")
+		}
+
+		if _, ok := irsdk.Vars.Vars["Speed"]; !ok {
+			log.Fatal("Field `Speed` doesn't exist")
+		}
+
+		gear := int32(irsdk.Vars.Vars["Gear"].Value.(int))
+		rpm := int32(irsdk.Vars.Vars["RPM"].Value.(float32))
+		speed := int32(msToKph(irsdk.Vars.Vars["Speed"].Value.(float32)))
+
+		fmt.Printf("\033[?25l\033[2J\033[H")
+		fmt.Printf("Gear: %d, RPM: %d, Speed: %d", gear, rpm, speed)
+
+		<-mainLoopTicker.C
+	}
+}
+```
 
 
 ## SharedMem

constants.go

@@ -8,9 +8,10 @@ type Msg struct {
 }
 
 const (
+	MEMMAPFILENAME                  = "IRSDKMemMapFileName"
 	SimStatusUrl             string = "http://127.0.0.1:32034/get_sim_status?object=simStatus"
 	IRSDK_DATAVALIDEVENTNAME string = "Local\\IRSDKDataValidEvent"
-	IRSDK_MEMMAPFILENAME     string = "Local\\IRSDKMemMapFileName"
+	IRSDK_MEMMAPFILENAME     string = "Local\\" + MEMMAPFILENAME
 	IRSDK_BROADCASTMSGNAME   string = "IRSDK_BROADCASTMSG"
 	fileMapSize              uint32 = 1164 * 1024
 	connTimeout              int64  = 30
@@ -116,10 +117,31 @@ const (
 // CamNose
 )
 
-
 // Some other constants that I need to get trough
 // // bit fields
-// enum irsdk_EngineWarnings 
+
+type bitfieldValue struct {
+	Value int
+	Name  string
+}
+
+// EngineWarnings const
+var (
+	irsdkWaterTempWarning    = bitfieldValue{0x01, "irsdk_waterTempWarning"}
+	irsdkFuelPressureWarning = bitfieldValue{0x02, "irsdk_fueldPressureWarning"}
+	irsdkOilPressureWarning  = bitfieldValue{0x04, "irsdk_oilPressureWarning"}
+	irsdkEngineStalled       = bitfieldValue{0x08, "irsdk_engineStalled"}
+	irsdkPitSpeedLimiter     = bitfieldValue{0x10, "irsdk_pitSpeedLimiter"}
+	irsdkRevLimiterActive    = bitfieldValue{0x20, "irsdk_revLimiterActive"}
+	irsdkAbsActive           = bitfieldValue{0x100, "irsdk_absActive"}
+	irsdkEngineWarnings      = []bitfieldValue{
+		irsdkWaterTempWarning, irsdkFuelPressureWarning,
+		irsdkOilPressureWarning, irsdkEngineStalled, irsdkPitSpeedLimiter, irsdkRevLimiterActive,
+		irsdkAbsActive,
+	}
+)
+
+// enum irsdk_EngineWarnings
 // {
 // 	irsdk_waterTempWarning		= 0x01,
 // 	irsdk_fuelPressureWarning	= 0x02,
@@ -165,7 +187,7 @@ const (
 // };
 //
 //
-// // status 
+// // status
 // enum irsdk_TrkLoc
 // {
 // 	irsdk_NotInWorld = -1,

diskSubHeader.go

@@ -4,6 +4,8 @@ import (
 	"bytes"
 	"encoding/binary"
 	"fmt"
+
+	"github.com/ESilva15/goirsdk/logger"
 )
 
 const (
@@ -19,6 +21,31 @@ type DiskSubHeader struct {
 	RecordCount int32   // RecordCount holds the number of data frames
 }
 
+// readSubheader will read the subheader contents out of the telemetry data
+func (i *IBT) readSubheader() error {
+	log := logger.GetInstance()
+
+	var subheaderRaw [SubHeaderSize]byte
+	_, err := i.File.ReadAt(subheaderRaw[:], HeaderSize)
+	if err != nil {
+		return fmt.Errorf("failed to read disk subheaders from file: %v", err)
+	}
+	i.SubHeaders, err = parseTelemetrySubHeader(subheaderRaw)
+	if err != nil {
+		return fmt.Errorf("unable to parse disk subheaders from file: %v", err)
+	}
+
+	// Write to the output file - TODO add the check
+	if i.Opts.IBTExport {
+		err = i.exportIBT(subheaderRaw[:], HeaderSize)
+		if err != nil {
+			log.Printf("failed to export subheaders: %v\n", err)
+		}
+	}
+
+	return nil
+}
+
 // parseTelemetrySubHeader will return a pointer to a DiskSubHeader variable
 // or nil if an error occurs. In which case the error return value is more
 // valuable

examples/read_from_ibt_file/read_from_ibt_file.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/ESilva15/goirsdk"
+)
+
+func msToKph(v float32) int {
+	return int((3600 * v) / 1000)
+}
+
+func main() {
+	// Instantiate our iRacing SDK instance
+	irsdk, err := goirsdk.Init(goirsdk.Options{
+		SourceType:    goirsdk.IBTFile,
+		SourcePath:    "../../../../testTelemetry/gt3_mustang_bathurst.ibt",
+		IBTExportType: goirsdk.SharedMemoryFile,
+		IBTExportPath: "./exported.ibt",
+		IBTExport:     true,
+	})
+	if err != nil {
+		log.Fatalf("Failed to create iRacing interface: %v", err)
+	}
+	defer irsdk.Close()
+
+	// Set up a loop to iterate our data
+	// TODO: revert this 240 back to 60 because i recorded the thing wrong or whatever
+	mainLoopTicker := time.NewTicker(time.Second / 240)
+	defer mainLoopTicker.Stop()
+
+	for {
+		// Update the data that the SDK is holding with the next tick
+		_, err := irsdk.Update(100 * time.Millisecond)
+		if err != nil {
+			log.Printf("could not update data: %v", err)
+			continue
+		}
+
+		// Vehicle Movement data gathered from the names we can find on the
+		// telemetry_docs.pdf file
+		// - I wish to make this less verbose if possible
+		if _, ok := irsdk.Vars.Vars["Gear"]; !ok {
+			log.Fatal("Field `Gear` doesn't exist")
+		}
+
+		if _, ok := irsdk.Vars.Vars["RPM"]; !ok {
+			log.Fatal("Field `RPM` doesn't exist")
+		}
+
+		if _, ok := irsdk.Vars.Vars["Speed"]; !ok {
+			log.Fatal("Field `Speed` doesn't exist")
+		}
+
+		gear := int32(irsdk.Vars.Vars["Gear"].Value.(int))
+		rpm := int32(irsdk.Vars.Vars["RPM"].Value.(float32))
+		speed := int32(msToKph(irsdk.Vars.Vars["Speed"].Value.(float32)))
+
+		fmt.Printf("\033[?25l\033[2J\033[H")
+		fmt.Printf("Gear: %d, RPM: %d, Speed: %d", gear, rpm, speed)
+
+		<-mainLoopTicker.C
+	}
+}

examples/read_from_mmap_file/read_from_mmap_file.go

@@ -0,0 +1,62 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/ESilva15/goirsdk"
+)
+
+func msToKph(v float32) int {
+	return int((3600 * v) / 1000)
+}
+
+func main() {
+	// Instantiate our iRacing SDK instance
+	irsdk, err := goirsdk.Init(goirsdk.Options{
+		SourceType: goirsdk.SharedMemoryFile,
+	})
+	if err != nil {
+		log.Fatalf("Failed to create iRacing interface: %v", err)
+	}
+	defer irsdk.Close()
+
+	// Set up a loop to iterate our data
+	// TODO: revert this 240 back to 60 because i recorded the thing wrong or whatever
+	mainLoopTicker := time.NewTicker(time.Second / 240)
+	defer mainLoopTicker.Stop()
+
+	for {
+		// Update the data that the SDK is holding with the next tick
+		_, err := irsdk.Update(100 * time.Millisecond)
+		if err != nil {
+			log.Printf("could not update data: %v", err)
+			continue
+		}
+
+		// Vehicle Movement data gathered from the names we can find on the
+		// telemetry_docs.pdf file
+		// - I wish to make this less verbose if possible
+		if _, ok := irsdk.Vars.Vars["Gear"]; !ok {
+			log.Fatal("Field `Gear` doesn't exist")
+		}
+
+		if _, ok := irsdk.Vars.Vars["RPM"]; !ok {
+			log.Fatal("Field `RPM` doesn't exist")
+		}
+
+		if _, ok := irsdk.Vars.Vars["Speed"]; !ok {
+			log.Fatal("Field `Speed` doesn't exist")
+		}
+
+		gear := int32(irsdk.Vars.Vars["Gear"].Value.(int))
+		rpm := int32(irsdk.Vars.Vars["RPM"].Value.(float32))
+		speed := int32(msToKph(irsdk.Vars.Vars["Speed"].Value.(float32)))
+
+		fmt.Printf("\033[?25l\033[2J\033[H")
+		fmt.Printf("Gear: %d, RPM: %d, Speed: %d", gear, rpm, speed)
+
+		<-mainLoopTicker.C
+	}
+}

go.mod

@@ -1,10 +1,10 @@
-module github.com/ESilva15/goirsdk
-
-go 1.23.2
-
-require (
-	github.com/google/go-cmp v0.6.0
-	golang.org/x/sys v0.26.0
-	golang.org/x/text v0.19.0
-	gopkg.in/yaml.v3 v3.0.1
-)
+module github.com/ESilva15/goirsdk
+
+go 1.23.2
+
+require (
+	github.com/google/go-cmp v0.6.0
+	golang.org/x/sys v0.29.0
+	golang.org/x/text v0.19.0
+	gopkg.in/yaml.v3 v3.0.1
+)

go.sum

@@ -1,10 +1,10 @@
-github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
-github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-golang.org/x/sys v0.26.0 h1:KHjCJyddX0LoSTb3J+vWpupP9p0oznkqVk/IfjymZbo=
-golang.org/x/sys v0.26.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/text v0.19.0 h1:kTxAhCbGbxhK0IwgSKiMO5awPoDQ0RpfiVYBfK860YM=
-golang.org/x/text v0.19.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
+golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.19.0 h1:kTxAhCbGbxhK0IwgSKiMO5awPoDQ0RpfiVYBfK860YM=
+golang.org/x/text v0.19.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

headers.go

@@ -4,6 +4,8 @@ import (
 	"bytes"
 	"encoding/binary"
 	"fmt"
+
+	"github.com/ESilva15/goirsdk/logger"
 )
 
 const (
@@ -13,30 +15,60 @@ const (
 
 // TelemetryHeaders struct to hold an IBT file's headers
 type TelemetryHeaders struct {
-	Version int32
-	// Status of 1 indicates a completed session and status of 0 a live session
-	Status int32
-	// TickRate indicates the frequency of writes (usually 60)
-	TickRate int32
-	// SessionInfoUpdate indicates the number of times the SessionInfo was
+	Version           int32
+	Status            int32 // Status of 1 indicates a completed session and status of 0 a live session
+	TickRate          int32 // TickRate indicates the frequency of writes (usually 60)
+	SessionInfoUpdate int32 // SessionInfoUpdate indicates the number of times the SessionInfo was
 	// updated. 0 for finished sessions and >1 for active sessions
-	SessionInfoUpdate int32
-	// SessionInfoLength is the length of the session info buffer
-	SessionInfoLength int32
-	// SessionInfoOffset is the offset of the session info in the buffer
-	SessionInfoOffset int32
-	// NumVars is the number of variables in each input
-	NumVars int32
-	// VarHeaderOffset is the offset of the VarHeader
-	VarHeaderOffset int32
-	// NumBuf will be 1 for static files and 3 for live telemetry files
-	NumBuf int32
-	// BufLen is the length for parsing VarHeader values
-	BufLen int32
-	// Padding
-	Padding [12]byte
-	// I still don't know what this is:
-	BufOffset int32
+	SessionInfoLength int32    // SessionInfoLength is the length of the session info buffer
+	SessionInfoOffset int32    // SessionInfoOffset is the offset of the session info in the buffer
+	NumVars           int32    // NumVars is the number of variables in each input
+	VarHeaderOffset   int32    // VarHeaderOffset is the offset of the VarHeader
+	NumBuf            int32    // NumBuf will be 1 for static files and 3 for live telemetry files
+	BufLen            int32    // BufLen is the length for parsing VarHeader values
+	Padding           [12]byte // Padding
+	BufOffset         int32    // I still don't know what this is:
+}
+
+// readHeader will read the header out of the telemetry data
+func (i *IBT) readHeader() error {
+	log := logger.GetInstance()
+
+	var headerRaw [FileHeaderSize]byte
+	_, err := i.File.ReadAt(headerRaw[:], 0)
+	if err != nil {
+		return fmt.Errorf("failed to read headers from file: %v", err)
+	}
+	i.Headers, err = parseTelemetryHeader(headerRaw)
+	if err != nil {
+		return fmt.Errorf("unable to read headers from file: %v", err)
+	}
+
+	// Write to the output file - TODO: this should only write if necessary
+	if i.Opts.IBTExport {
+		err = i.exportIBT(headerRaw[:], 0)
+		if err != nil {
+			log.Printf("Failed to export headers: %v\n", err)
+		}
+	}
+
+	return nil
+}
+
+// parseTelemetryHeader will read the IBT file headers from a correctly sized
+// buffer.
+// You need to pass a the first FILE_HEADER_SIZE bytes of the buffer
+func parseTelemetryHeader(buf [FileHeaderSize]byte) (*TelemetryHeaders, error) {
+	// utils.HexDump(buf[:])
+	// fmt.Printf("Len: %d\n", len(buf))
+
+	dst := TelemetryHeaders{}
+	err := binary.Read(bytes.NewBuffer(buf[:]), binary.LittleEndian, &dst)
+	if err != nil {
+		return nil, fmt.Errorf("unable to unpack data: %v", err)
+	}
+
+	return &dst, nil
 }
 
 // ToString renders a string showing the values of the struct
@@ -61,19 +93,3 @@ func (th *TelemetryHeaders) ToString() string {
 		th.NumBuf, th.NumBuf, th.BufLen, th.BufLen, th.BufOffset, th.BufOffset,
 	)
 }
-
-// parseTelemetryHeader will read the IBT file headers from a correctly sized
-// buffer.
-// You need to pass a the first FILE_HEADER_SIZE bytes of the buffer
-func parseTelemetryHeader(buf [FileHeaderSize]byte) (*TelemetryHeaders, error) {
-	// utils.HexDump(buf[:])
-	// fmt.Printf("Len: %d\n", len(buf))
-
-	dst := TelemetryHeaders{}
-	err := binary.Read(bytes.NewBuffer(buf[:]), binary.LittleEndian, &dst)
-	if err != nil {
-		return nil, fmt.Errorf("unable to unpack data: %v", err)
-	}
-
-	return &dst, nil
-}

irsdk.go

@@ -3,23 +3,15 @@ package goirsdk
 
 import (
 	"fmt"
-	"log"
+	"io"
 	"os"
 
-	"io"
-
-	"github.com/ESilva15/goirsdk/winutils"
+	"github.com/ESilva15/goirsdk/logger"
+	"github.com/ESilva15/goirsdk/mmaputils"
+	"github.com/ESilva15/goirsdk/sharedMem"
 	"gopkg.in/yaml.v3"
 )
 
-const (
-	ibtFile = "./telemetryFiles/mx5_2016Okayama_full_2024_10_19_22_02_12.ibt"
-)
-
-func msToKph(v float32) int {
-	return int((3600 * v) / 1000)
-}
-
 // Reader is an interface to represent the readable data that can be either
 // a .ibt file (or live data, hopefully)
 type Reader interface {
@@ -28,16 +20,47 @@ type Reader interface {
 	io.ReadCloser
 }
 
+type Writer interface {
+	io.WriterAt
+	io.Closer
+}
+
+type TelemetryContainer int
+
+const (
+	IBTFile          TelemetryContainer = iota
+	SharedMemoryFile TelemetryContainer = iota
+)
+
+type Options struct {
+	SourceType            TelemetryContainer // type of source data
+	SourcePath            string             // Path to source
+	IBTExportType         TelemetryContainer // export type of telemetry: store .ibt or replay in shm
+	IBTExportPath         string             // path where to export the data
+	IBTExport             bool               // whether to export the telemetry data
+	SessionInfoExport     bool               // whether to export the session info data
+	SessionInfoExportPath string             // path where to export the session info
+}
+
 // IBT struct will hold the relevant data for a given IBT file
 type IBT struct {
-	File         Reader                    // Source of the data
-	FileToExport *os.File                  // If set, it will export the IBT data to the file
-	YAMLExport   *os.File                  // If set, it will export the session YAML to the file
-	Headers      *TelemetryHeaders         // IBT file Headers
-	SubHeaders   *DiskSubHeader            // IBT file Sub Headers
-	SessionInfo  *SessionInfoYAML          // IBT file Session Info
-	Vars         *TelemetryVars            // Vars will hold the telemetry data
-	winUtils     *winutils.IRacingWinUtils // WinUtils gives access to the system utilities
+	File Reader // Source of the data
+	Opts Options
+	// TODO: IBTExporter should be an interface because we need to support shm too
+	IBTExporter Writer
+	// IBTExport *os.File // If set, it will export the IBT data to the file
+	// IBTExportPath  string                    // Path for IBT export
+	// YAMLExport     *os.File                  // If set, it will export the session YAML to the file
+	// YAMLExportPath string                    // Path for YAML export
+	winUtils *mmaputils.IRacingWinUtils // WinUtils gives access to the system utilities
+
+	// TODO: fragment this struct a little bit, for now I want to actually get
+	// stuff done so its enough to work as is
+	// Actual FILE
+	Headers     *TelemetryHeaders // IBT file Headers
+	SubHeaders  *DiskSubHeader    // IBT file Sub Headers
+	SessionInfo *SessionInfoYAML  // IBT file Session Info
+	Vars        *TelemetryVars    // Vars will hold the telemetry data
 }
 
 func (i *IBT) IsConnected() bool {
@@ -53,10 +76,13 @@ func (i *IBT) IsConnected() bool {
 	return false
 }
 
-func (i *IBT) exportYAML(path string) {
-	file, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
+func (i *IBT) exportYAML() error {
+	log := logger.GetInstance()
+
+	file, err := os.OpenFile(i.Opts.SessionInfoExportPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o644)
 	if err != nil {
-		log.Println("Failed to open output file for YAML: ", err)
+		log.Printf("Failed to open file for YAML export: %v\n", err)
+		return fmt.Errorf("failed to open output file for YAML: %v", err)
 	}
 	defer file.Close()
 
@@ -64,110 +90,137 @@ func (i *IBT) exportYAML(path string) {
 
 	err = enc.Encode(i.SessionInfo)
 	if err != nil {
-		log.Println("Failed to print YAML to file: ", err)
+		log.Printf("Failed to write into file for YAML export: %v\n", err)
+		return fmt.Errorf("failed to write YAML contents to file: %v", err)
 	}
+
+	return nil
 }
 
-// Init serves to initialize and get a hold of a IBT struct
-func Init(f Reader, exportTelem string, exportYAML string) (*IBT, error) {
-	// Read the header of the file
+func (i *IBT) exportIBT(data []byte, offset int64) error {
+	log := logger.GetInstance()
+
+	_, err := i.IBTExporter.WriteAt(data, offset)
+	if err != nil {
+		i.IBTExporter.Close()
+		i.IBTExporter = nil
+		log.Println("Won't attempt to export anymore")
+		return err
+	}
+
+	return nil
+}
+
+func (i *IBT) openSource() error {
 	var err error
-	ibt := IBT{
-		File:         f,
-		FileToExport: nil,
-		YAMLExport:   nil,
-		Vars:         &TelemetryVars{},
-		winUtils:     nil,
-	}
 
-	// If requested to output to a telemetry file
-	if exportTelem != "" {
-		ibt.FileToExport, err = os.OpenFile(exportTelem, os.O_CREATE|os.O_RDWR, 0644)
-		if err != nil {
-			return nil, err
-		}
-		ibt.FileToExport.Sync()
-	}
-
-	if ibt.File == nil {
+	switch i.Opts.SourceType {
+	case SharedMemoryFile:
 		// User is requesting us to read live data - present in the mem map file
-		ibt.File, err = winutils.OpenMemMap(IRSDK_MEMMAPFILENAME, fileMapSize)
+		i.File, err = mmaputils.OpenMemMap(MEMMAPFILENAME, fileMapSize)
 		if err != nil {
-			return nil, fmt.Errorf("Failed to open memory mapped file: %v", err)
+			return fmt.Errorf("failed to open memory mapped file: %+v", err)
 		}
 
 		// To use our windows interface we need to initialize it first
 		// it will return a struct with a pointer to the windows handles
 		// if, for some reason, we need to stub out this to run in on Linux its easier
-		ibt.winUtils, err = winutils.Init()
+		i.winUtils, err = mmaputils.Init()
 		if err != nil {
-			return nil, err
+			return err
 		}
 
+		// I don't believe we need this on windows either, but I'll have to check
 		// We need to open the windows event thing
-		err = ibt.winUtils.OpenWinEvent(IRSDK_DATAVALIDEVENTNAME)
-		if err != nil {
-			return nil, err
-		}
+		// err = i.winUtils.OpenWinEvent(IRSDK_DATAVALIDEVENTNAME)
+		// if err != nil {
+		// 	return err
+		// }
 
 		// We need to open the broadcast channel
-		err = ibt.winUtils.OpenBroadcastChannel(IRSDK_BROADCASTMSGNAME)
+		// err = i.winUtils.OpenBroadcastChannel(IRSDK_BROADCASTMSGNAME)
+		// if err != nil {
+		// 	return err
+		// }
+	case IBTFile:
+		i.File, err = os.Open(i.Opts.SourcePath)
 		if err != nil {
-			return nil, err
+			return fmt.Errorf("failed to open file `%s`: %+v", i.Opts.SourcePath, err)
+		}
+	default:
+		return fmt.Errorf("a source type must be specified")
+	}
+
+	return nil
+}
+
+func (i *IBT) openExporter() error {
+	var err error
+
+	switch i.Opts.IBTExportType {
+	case SharedMemoryFile:
+		// Lets create a shared memory file!
+		shm, err := sharedMem.Create(MEMMAPFILENAME, fileMapSize)
+		if err != nil {
+			return fmt.Errorf("unable to create memory map file: %+v", err)
+		}
+
+		i.IBTExporter = shm
+	case IBTFile:
+		i.IBTExporter, err = os.OpenFile(i.Opts.IBTExportPath, os.O_CREATE|os.O_RDWR, 0o644)
+		if err != nil {
+			return fmt.Errorf("failed to open ibt export file: %v", err)
+		}
+	}
+
+	return nil
+}
+
+// Init serves to initialize and get a hold of a IBT struct
+// Receives an Options struct with the required configurations
+func Init(opts Options) (*IBT, error) {
+	// log := logger.GetInstance()
+
+	// Create our irsdk instance
+	var err error
+	ibt := IBT{
+		Opts:     opts,
+		Vars:     &TelemetryVars{},
+		winUtils: nil,
+	}
+
+	// Setup the source
+	err = ibt.openSource()
+	if err != nil {
+		return nil, err
+	}
+
+	// Setup the IBT data export - can be either shared memory or data file
+	if opts.IBTExport {
+		err = ibt.openExporter()
+		if err != nil {
+			// We log this only, or return some type of message
+			// Set the option to false so we won't export
+			ibt.Opts.IBTExport = false
 		}
 	}
 
 	// Read the file headers
-	var headerRaw [FileHeaderSize]byte
-	_, err = ibt.File.ReadAt(headerRaw[:], 0)
+	err = ibt.readHeader()
 	if err != nil {
-		return nil, fmt.Errorf("Failed to read headers from file: %v", err)
-	}
-	ibt.Headers, err = parseTelemetryHeader(headerRaw)
-	if err != nil {
-		return nil, fmt.Errorf("Unable to read headers from file: %v", err)
-	}
-	// Write to the output file
-	_, err = ibt.FileToExport.WriteAt(headerRaw[:], 0)
-	if err != nil {
-		log.Fatal(err)
+		return nil, err
 	}
 
 	// Read the disk sub headers
-	var subheaderRaw [SubHeaderSize]byte
-	_, err = ibt.File.ReadAt(subheaderRaw[:], HeaderSize)
+	err = ibt.readSubheader()
 	if err != nil {
-		return nil, fmt.Errorf("Failed to read disk subheaders from file: %v", err)
-	}
-	ibt.SubHeaders, err = parseTelemetrySubHeader(subheaderRaw)
-	if err != nil {
-		return nil, fmt.Errorf("Unable to parse disk subheaders from file: %v", err)
-	}
-	// Write to the output file
-	_, err = ibt.FileToExport.WriteAt(subheaderRaw[:], HeaderSize)
-	if err != nil {
-		log.Fatal(err)
+		return nil, err
 	}
 
 	// Read session info string
-	sessionInfoStringRaw := make([]byte, ibt.Headers.SessionInfoLength)
-	_, err = ibt.File.ReadAt(sessionInfoStringRaw, int64(ibt.Headers.SessionInfoOffset))
+	err = ibt.readSessionInfo()
 	if err != nil {
-		return nil, fmt.Errorf("Failed to read sessionInfoString from file: %v", err)
-	}
-	// Write to the output file
-	_, err = ibt.FileToExport.WriteAt(sessionInfoStringRaw[:], int64(ibt.Headers.SessionInfoOffset))
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	ibt.SessionInfo, err = parseSessionInfo(sessionInfoStringRaw, ibt.Headers.SessionInfoLength)
-	if err != nil {
-		return nil, fmt.Errorf("Unable to parse SessionInfoString from file: %v", err)
-	}
-	// Write to YAML output file
-	if exportYAML != "" {
-		ibt.exportYAML(exportYAML)
+		return nil, err
 	}
 
 	// Read the telemetry vars info
@@ -179,6 +232,7 @@ func Init(f Reader, exportTelem string, exportYAML string) (*IBT, error) {
 	return &ibt, nil
 }
 
+// Close cleans up our irsdk instance
 func (i *IBT) Close() {
 	if i.winUtils != nil {
 		// If its not live data, the user is the one with ownership of the handle

irsdk_test.go

@@ -0,0 +1,101 @@
+package goirsdk
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"sort"
+	"testing"
+	"time"
+)
+
+type StandingsLine struct {
+	CarIdx     int
+	LapPct     float32
+	Lap        int32
+	DriverName string
+	EstTime    float32
+	TimeBehind float32
+}
+
+func lapTimeRepresentation(t float32) string {
+	if t < 0 {
+		t = 0
+	}
+
+	wholeSeconds := int64(t)
+	lapTime := time.Unix(wholeSeconds, int64((t-float32(wholeSeconds))*1e9))
+
+	return lapTime.Format("04:05.000")
+}
+
+func TestFunctionality(t *testing.T) {
+	input, err := os.Open("../../testTelemetry/supercars_race_watkins_glenn.ibt")
+	if err != nil {
+		t.Fatal("Was unable to prepare telemetry file for testing.")
+	}
+
+	i, _ := Init(input, "", "")
+	defer i.Close()
+
+	// Set up a loop to iterate our data
+	mainLoopTicker := time.NewTicker(time.Second / 60)
+	defer mainLoopTicker.Stop()
+
+	for {
+		// Update the data that the SDK is holding with the next tick
+		_, err := i.Update(100 * time.Millisecond)
+		if err != nil {
+			log.Printf("could not update data: %v", err)
+			continue
+		}
+
+		// Vehicle Movement data gathered from the names we can find on the
+		// telemetry_docs.pdf file
+		// - I wish to make this less verbose if possible
+		if _, ok := i.Vars.Vars["CarIdxPosition"]; !ok {
+			log.Fatal("Field `CarIdxPosition` doesn't exist")
+		}
+		driversLapDistPct := i.Vars.Vars["CarIdxLapDistPct"].Value.([]float32)
+		driversEstTime := i.Vars.Vars["CarIdxEstTime"].Value.([]float32)
+		driversLap := i.Vars.Vars["CarIdxLap"].Value.([]int32)
+		// driversBehind := i.Vars.Vars["CarIdxF2Time"].Value.([]float32)
+
+		drivers := i.SessionInfo.DriverInfo.Drivers
+		myIdx := i.SessionInfo.DriverInfo.DriverCarIdx
+
+		standings := make([]StandingsLine, len(drivers))
+
+		fmt.Printf("\033[?25l\033[2J\033[H")
+		for k := range len(drivers) {
+			if drivers[k].CarIsPaceCar == 1 || drivers[k].IsSpectator == 1 {
+				continue
+			}
+
+			standings[k] = StandingsLine{
+				CarIdx:     k,
+				LapPct:     driversLapDistPct[k],
+				DriverName: drivers[k].UserName,
+				EstTime:    driversEstTime[k],
+				Lap:        driversLap[k],
+				TimeBehind: driversEstTime[myIdx],
+			}
+		}
+
+		sort.Slice(standings, func(i int, j int) bool {
+			if standings[i].Lap > int32(standings[j].Lap) {
+				return true
+			}
+
+			return standings[i].LapPct >= standings[j].LapPct
+		})
+
+		fmt.Printf("%v\n", driversEstTime)
+		// for p, v := range standings {
+		// 	fmt.Printf("[%2d] %-30s %13f %13f\n",
+		// 		p+1, v.DriverName, v.LapPct, driversEstTime[p] - driversEstTime[myIdx])
+		// }
+
+		<-mainLoopTicker.C
+	}
+}

logger/logger.go

@@ -0,0 +1,23 @@
+package logger
+
+import (
+	"log"
+	"os"
+	"sync"
+)
+
+var l *log.Logger
+var once sync.Once
+
+func createLogger() {
+  l = log.New(os.Stdout, "[ibtReader] ", log.LstdFlags | log.Lshortfile)
+}
+
+func GetInstance() *log.Logger {
+	once.Do(func() {
+    createLogger() 
+	})
+
+  return l
+}
+

mmaputils/mmaputils.go

@@ -2,10 +2,9 @@
 // is interface some windows stuff that we need for the:
 // - Broadcast Channel
 // - Valid Data Event windows thing
-package winutils
+package mmaputils
 
 import (
-	"github.com/ESilva15/goirsdk/sharedMem"
 	"io"
 	"time"
 )
@@ -32,23 +31,12 @@ func (u *IRacingWinUtils) Close() {
 	u.Utils.Close()
 }
 
-// OpenMemMap returns a Reader interface that can be used to read the data
-// No need to encapsulate it
-func OpenMemMap(path string, size uint32) (Reader, error) {
-	file, err := sharedMem.Open(path, size)
-	if err != nil {
-		return nil, err
-	}
-
-	return file, nil
-}
-
 // OpenWinEvent will open the named windows event
 func (u *IRacingWinUtils) OpenWinEvent(name string) error {
 	return u.Utils.OpenEvent(name)
 }
 
-// OpenWinEvent will open the broadcast channel
+// OpenBroadcastChannel will open the broadcast channel
 func (u *IRacingWinUtils) OpenBroadcastChannel(name string) error {
 	return u.Utils.OpenBroadcastChannel(name)
 }

mmaputils/mmaputils_linux.go

@@ -0,0 +1,129 @@
+//go:build (linux && cgo) || (darwin && cgo)
+
+package mmaputils
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"time"
+
+	"github.com/ESilva15/goirsdk/sharedMem"
+)
+
+type utils struct {
+	socketPath string
+	listener   *net.UnixConn
+}
+
+func newUtils() (*utils, error) {
+	return &utils{}, nil
+}
+
+func (u *utils) Close() {
+	if u.listener != nil {
+		u.listener.Close()
+		os.Remove(u.socketPath)
+	}
+}
+
+// OpenMemMap returns a Reader interface that can be used to read the data
+// No need to encapsulate it
+func OpenMemMap(name string, size uint32) (Reader, error) {
+	file, err := sharedMem.Open(name, size)
+	if err != nil {
+		return nil, fmt.Errorf("failed to open `%s` with err: %+v", name, err)
+	}
+
+	return file, nil
+}
+
+// OpenEvent creates or connects to a Unix socket for event signaling on Linux
+func (u *utils) OpenEvent(eventName string) error {
+	u.socketPath = fmt.Sprintf("/tmp/iracing_%s.sock", eventName)
+	_ = os.Remove(u.socketPath)
+
+	addr, err := net.ResolveUnixAddr("unixgram", u.socketPath)
+	if err != nil {
+		return err
+	}
+
+	l, err := net.ListenUnixgram("unixgram", addr)
+	if err != nil {
+		return err
+	}
+	u.listener = l
+	return nil
+}
+
+func (u *utils) OpenBroadcastChannel(name string) error {
+	// No-op or log stub on Linux
+	return nil
+}
+
+// CheckValidDataEvent waits for a pulse byte sent over the socket
+func (u *utils) CheckValidDataEvent(timeout time.Duration) bool {
+	if u.listener == nil {
+		return false
+	}
+
+	_ = u.listener.SetReadDeadline(time.Now().Add(timeout))
+	buf := make([]byte, 1)
+	_, err := u.listener.Read(buf)
+	return err == nil
+}
+
+func (u *utils) SendBroadcastMessage(id, p1, p2 uintptr) error {
+	return nil
+}
+
+// package winutils
+//
+// import (
+// 	"errors"
+// 	"sync"
+// 	"time"
+// )
+//
+// const (
+// 	WAIT_OBJECT_0 = 0
+// 	WAIT_TIMEOUT  = 258
+// )
+//
+// var (
+// 	once             sync.Once
+// 	ErrUnsupportedOS = errors.New("not found")
+// )
+//
+// type utils struct {
+// }
+//
+// // INITIALIZATION
+// func newUtils() (*utils, error) {
+// 	return nil, ErrUnsupportedOS
+// }
+//
+// func (u *utils) Close() {
+// }
+//
+// // openEvent opens a windows.Handle for a given event
+// func (u *utils) OpenEvent(eventName string) error {
+// 	return ErrUnsupportedOS
+// }
+//
+// // OpenBroadcastChannel opens up a broadcast channel to send commands to iracing
+// func (u *utils) OpenBroadcastChannel(name string) error {
+// 	return ErrUnsupportedOS
+// }
+//
+// // INITIALIZATION
+//
+// // openEvent waits for a good response for some given time
+// func (u *utils) CheckValidDataEvent(timeout time.Duration) bool {
+// 	return false
+// }
+//
+// // SendBroadcastMessage sends a message trough the broadcast channel
+// func (u *utils) SendBroadcastMessage(id, p1, p2 uintptr) error {
+//   return ErrUnsupportedOS
+// }

mmaputils/mmaputils_windows.go

@@ -1,13 +1,13 @@
-//go:build windows && cgo
-// +build windows,cgo
+// go:build windows
 
-package winutils
+package mmaputils
 
 import (
 	"sync"
 	"time"
 	"unsafe"
 
+	"github.com/ESilva15/goirsdk/sharedMem"
 	"golang.org/x/sys/windows"
 )
 
@@ -16,13 +16,11 @@ const (
 	WAIT_TIMEOUT  = 258
 )
 
-var (
-	once sync.Once
-)
+var once sync.Once
 
 type utils struct {
 	user32DLL     *windows.LazyDLL
-	wEvent        *windows.Handle
+	wEvent        windows.Handle
 	wBroadcastChn uintptr
 }
 
@@ -34,11 +32,22 @@ func newUtils() (*utils, error) {
 }
 
 func (u *utils) Close() {
-	closeEvent(u.wEvent)
+	closeEvent(&u.wEvent)
 	// Do we need to unload the user32DLL ???
 	// Do we need to close the broadcast channel ???
 }
 
+// OpenMemMap returns a Reader interface that can be used to read the data
+// No need to encapsulate it
+func OpenMemMap(name string, size uint32) (Reader, error) {
+	file, err := sharedMem.Open("Local\\"+name, size)
+	if err != nil {
+		return nil, err
+	}
+
+	return file, nil
+}
+
 // openEvent opens a windows.Handle for a given event
 func (u *utils) OpenEvent(eventName string) error {
 	name, err := windows.UTF16PtrFromString(eventName)
@@ -50,7 +59,7 @@ func (u *utils) OpenEvent(eventName string) error {
 	if err != nil {
 		return err
 	}
-	u.wEvent = &event
+	u.wEvent = event
 
 	return nil
 }
@@ -90,7 +99,7 @@ func (u *utils) CheckValidDataEvent(timeout time.Duration) bool {
 	t0 := time.Now().UnixNano()
 	timeoutInt := uint32(timeout / time.Millisecond)
 
-	result, err := windows.WaitForSingleObject(*u.wEvent, timeoutInt)
+	result, err := windows.WaitForSingleObject(u.wEvent, timeoutInt)
 	if err != nil {
 		remaining := timeoutInt - uint32((time.Now().UnixNano()-t0)/1000000)
 		if remaining > 0 {

sessionInfo.go

@@ -2,9 +2,12 @@ package goirsdk
 
 import (
 	"encoding/json"
+	"fmt"
 	"log"
 	"strings"
 
+	"github.com/ESilva15/goirsdk/logger"
+
 	"golang.org/x/text/encoding/charmap"
 	"gopkg.in/yaml.v3"
 )
@@ -307,6 +310,40 @@ type Driver struct {
 	TeamIncidentCount       int     `yaml:"TeamIncidentCount"`
 }
 
+// readSessionInfo will read the session info yaml out of the telemetry data
+func (i *IBT) readSessionInfo() error {
+	log := logger.GetInstance()
+
+	sessionInfoStringRaw := make([]byte, i.Headers.SessionInfoLength)
+	_, err := i.File.ReadAt(sessionInfoStringRaw, int64(i.Headers.SessionInfoOffset))
+	if err != nil {
+		return fmt.Errorf("Failed to read sessionInfoString from file: %v", err)
+	}
+
+	// Write to the output file
+	if i.Opts.IBTExport {
+		err := i.exportIBT(sessionInfoStringRaw[:], int64(i.Headers.SessionInfoOffset))
+		if err != nil {
+			log.Printf("Failed to export offline telemetry data: %v", err)
+		}
+	}
+
+	i.SessionInfo, err = parseSessionInfo(sessionInfoStringRaw, i.Headers.SessionInfoLength)
+	if err != nil {
+		return fmt.Errorf("Unable to parse SessionInfoString from file: %v", err)
+	}
+
+	// Write to YAML output file
+	if i.Opts.SessionInfoExport {
+		err := i.exportYAML()
+		if err != nil {
+			log.Printf("Failed to export YAML string: %v\n", err)
+		}
+	}
+
+	return nil
+}
+
 // parseSessionInfo will parse the sessionInfo buffer into the SessionInfoYAML
 // struct
 func parseSessionInfo(buf []byte, len int32) (*SessionInfoYAML, error) {

variables.go

@@ -7,6 +7,7 @@ import (
 	"io"
 	"log"
 	"math"
+	"strconv"
 	"strings"
 	"time"
 )
@@ -39,11 +40,13 @@ var (
 	}
 )
 
-type IRacingState int
-type VarType struct {
-	Size int    // Size is the var type size in bytes
-	Name string // Name is the irsdk var name
-}
+type (
+	IRacingState int
+	VarType      struct {
+		Size int    // Size is the var type size in bytes
+		Name string // Name is the irsdk var name
+	}
+)
 
 type IBTVar struct {
 	Type        int32
@@ -71,6 +74,20 @@ type Var struct {
 	Value interface{}
 }
 
+func (v *Var) ToString() string {
+	return fmt.Sprintf(
+		"Type:        %5d (0x%08x)\n"+
+			"Offset:      %5d (0x%08x)\n"+
+			"Count:       %5d (0x%08x)\n"+
+			"CountAsTime: %5t\n"+
+			"Name:        %s\n"+
+			"Description: %s\n"+
+			"Unit:        %s",
+		v.Type, v.Type, v.Offset, v.Offset, v.Count, v.Count,
+		v.CountAsTime, v.Name, v.Description, v.Unit,
+	)
+}
+
 func (v *IBTVar) ToString() string {
 	return fmt.Sprintf(
 		"Type:        %5d (0x%08x)\n"+
@@ -91,9 +108,10 @@ type varBuffer struct {
 }
 
 type TelemetryVars struct {
-	Tick         int32          // Keeps track of the current data buffer tick
-	RecorderTick int32          // Counts from 0 when creating a telemetry file from a replay or live data
-	Vars         map[string]Var // Variables content
+	Tick         int32 // Keeps track of the current data buffer tick
+	RecorderTick int32 // Counts from 0 when creating a telemetry file from a
+	// replay or live data
+	Vars map[string]Var // Variables content
 }
 
 func (i *IBT) readVariablerHeaders() error {
@@ -108,11 +126,13 @@ func (i *IBT) readVariablerHeaders() error {
 			return err
 		}
 
-		_, err = i.FileToExport.WriteAt(rbuf, int64(i.Headers.VarHeaderOffset+k*VarHeaderSize))
-		if err != nil {
-			log.Fatal(err)
+		if i.Opts.IBTExport {
+			err = i.exportIBT(rbuf, int64(i.Headers.VarHeaderOffset+k*VarHeaderSize))
+			if err != nil {
+				// Don't outright kill it here - maybe nowhere else
+				log.Printf("Failed to export variable contents: %v\n", err)
+			}
 		}
-		i.FileToExport.Sync()
 
 		var dst IBTVar
 		err = binary.Read(bytes.NewBuffer(rbuf[:]), binary.LittleEndian, &dst)
@@ -137,6 +157,38 @@ func (i *IBT) readVariablerHeaders() error {
 	return nil
 }
 
+func (i *IBT) parseEngineWarnings() {
+	val, ok := i.Vars.Vars["EngineWarnings"]
+	if !ok {
+		log.Fatal("no engine warnings")
+	}
+
+	bitfield, err := strconv.ParseInt(val.Value.(string), 0, 64)
+	if err != nil {
+		log.Fatal("Unable to get engine warnings: " + err.Error())
+	}
+
+	for _, ew := range irsdkEngineWarnings {
+		result := (int(bitfield) & ew.Value) != 0
+		i.Vars.Vars[ew.Name] = Var{Value: result}
+	}
+}
+
+// parseBitfieldVariables will parse the variables:
+// - irsdk_CameraState "CamCameraState"
+// - irsdk_EngineWarnings "EngineWarnings"
+// - irsdk_PitSvFlags "PitSvFlags"
+// - irsdk_Flags "SessionFlags"
+// - irsdk_SessionState "SessionState"
+// - irsdk_TrkLoc "CarIdxTrackSurface"
+//
+// The approach for now will be to create unique entries in the data map for
+// the fields in these variables
+func (i *IBT) parseBitfieldVariables() {
+	// Parse the EngineWarnings variables - its the only one for now
+	i.parseEngineWarnings()
+}
+
 func (i *IBT) readData(buf []byte) error {
 	for k, v := range i.Vars.Vars {
 		// Slice of the variable value in the buffer
@@ -145,27 +197,119 @@ func (i *IBT) readData(buf []byte) error {
 		// Read the value
 		switch v.Type {
 		case IRSDK_char:
-			v.Value = string(rbuf[0])
+			if v.Count > 1 {
+				// Array of data
+				data := make([]string, v.Count)
+				for entry := 0; entry < int(v.Count); entry++ {
+					entryOffset := v.Offset + int32(entry)*int32(VarTypes[int(v.Type)].Size)
+					rbuf := buf[entryOffset : entryOffset+int32(VarTypes[int(v.Type)].Size)]
+
+					newValue := string(rbuf[0])
+					data[entry] = newValue
+				}
+
+				v.Value = data
+			} else {
+				// Single value
+				v.Value = string(rbuf[0])
+			}
 		case IRSDK_bool:
-			v.Value = int(rbuf[0]) > 0
+			if v.Count > 1 {
+				// Array of data
+				data := make([]bool, v.Count)
+				for entry := 0; entry < int(v.Count); entry++ {
+					entryOffset := v.Offset + int32(entry)*int32(VarTypes[int(v.Type)].Size)
+					rbuf := buf[entryOffset : entryOffset+int32(VarTypes[int(v.Type)].Size)]
+
+					newValue := int(rbuf[0]) > 0
+					data[entry] = newValue
+				}
+
+				v.Value = data
+			} else {
+				// Single value
+				v.Value = int(rbuf[0]) > 0
+			}
 		case IRSDK_int:
-			v.Value = int(binary.LittleEndian.Uint32(rbuf))
+			if v.Count > 1 {
+				// Array of data
+				data := make([]int32, v.Count)
+				for entry := 0; entry < int(v.Count); entry++ {
+					entryOffset := v.Offset + int32(entry)*int32(VarTypes[int(v.Type)].Size)
+					rbuf := buf[entryOffset : entryOffset+int32(VarTypes[int(v.Type)].Size)]
+					newValue := int32(binary.LittleEndian.Uint32(rbuf))
+					data[entry] = newValue
+				}
+
+				v.Value = data
+			} else {
+				// Single value
+				v.Value = int(binary.LittleEndian.Uint32(rbuf))
+			}
 		case IRSDK_bitField:
-			v.Value = fmt.Sprintf("0x%x", int(binary.LittleEndian.Uint32(rbuf)))
+			if v.Count > 1 {
+				// Array of data
+				data := make([]string, v.Count)
+				for entry := 0; entry < int(v.Count); entry++ {
+					entryOffset := v.Offset + int32(entry)*int32(VarTypes[int(v.Type)].Size)
+					rbuf := buf[entryOffset : entryOffset+int32(VarTypes[int(v.Type)].Size)]
+					newValue := fmt.Sprintf("0x%x", int(binary.LittleEndian.Uint32(rbuf)))
+					data[entry] = newValue
+				}
+
+				v.Value = data
+			} else {
+				// Single value
+				v.Value = fmt.Sprintf("0x%x", int(binary.LittleEndian.Uint32(rbuf)))
+			}
 		case IRSDK_float:
-			v.Value = math.Float32frombits(uint32(binary.LittleEndian.Uint32(rbuf)))
+			if v.Count > 1 {
+				// Array of data
+				data := make([]float32, v.Count)
+				for entry := 0; entry < int(v.Count); entry++ {
+					entryOffset := v.Offset + int32(entry)*int32(VarTypes[int(v.Type)].Size)
+					rbuf := buf[entryOffset : entryOffset+int32(VarTypes[int(v.Type)].Size)]
+					newValue := math.Float32frombits(uint32(binary.LittleEndian.Uint32(rbuf)))
+					data[entry] = newValue
+				}
+
+				v.Value = data
+			} else {
+				// Single value
+				v.Value = math.Float32frombits(uint32(binary.LittleEndian.Uint32(rbuf)))
+			}
 		case IRSDK_double:
-			v.Value = math.Float64frombits(uint64(binary.LittleEndian.Uint64(rbuf)))
+			if v.Count > 1 {
+				// Array of data
+				data := make([]float64, v.Count)
+				for entry := 0; entry < int(v.Count); entry++ {
+					entryOffset := v.Offset + int32(entry)*int32(VarTypes[int(v.Type)].Size)
+					rbuf := buf[entryOffset : entryOffset+int32(VarTypes[int(v.Type)].Size)]
+					newValue := math.Float64frombits(uint64(binary.LittleEndian.Uint64(rbuf)))
+					data[entry] = newValue
+				}
+
+				v.Value = data
+			} else {
+				// Single value
+				v.Value = math.Float64frombits(uint64(binary.LittleEndian.Uint64(rbuf)))
+			}
 		}
 		// --------------
 
 		i.Vars.Vars[k] = v
 	}
 
+	// Parse the bitfield variables here
+	i.parseBitfieldVariables()
+
 	return nil
 }
 
+// Update will read the next data chunk from the telemetry data, works for both the
+// live and offline data
 func (i *IBT) Update(timeout time.Duration) (IRacingState, error) {
+	// This is what happens if we are reading live data
 	if i.winUtils != nil {
 		// Put a way to check if the sim is active here
 		// fmt.Println("NOT CHECKING IF SIM IS ACTIVE - ADD ME")
@@ -204,9 +348,20 @@ func (i *IBT) Update(timeout time.Duration) (IRacingState, error) {
 			return Failed, err
 		}
 
-		_, err = i.FileToExport.WriteAt(buf, int64(i.Headers.BufOffset+i.Vars.RecorderTick*i.Headers.BufLen))
-		if err != nil {
-			log.Fatalf("Failed to write to file [2]: %v", err)
+		if i.Opts.IBTExport {
+			// Dirty attempt at getting this to work to write to a memory mapped file
+			switch i.Opts.IBTExportType {
+			case IBTFile:
+				err = i.exportIBT(buf, int64(i.Headers.BufOffset+i.Vars.RecorderTick*i.Headers.BufLen))
+				if err != nil {
+					log.Printf("Failed to export live telemetry data: %v", err)
+				}
+			case SharedMemoryFile:
+				err = i.exportIBT(buf, int64(i.Headers.BufOffset))
+				if err != nil {
+					log.Printf("Failed to export live telemetry data: %v", err)
+				}
+			}
 		}
 
 		err = i.readData(buf)
@@ -218,8 +373,10 @@ func (i *IBT) Update(timeout time.Duration) (IRacingState, error) {
 			return Ended, nil
 		}
 
+		// Document why this is here, I don't remember the exact words right now
 		i.Vars.RecorderTick++
 	} else {
+		// This is what happens if we are reading from an .ibt file
 		// This will get the dataframe corresponding to a given tick
 		start := i.Headers.BufOffset + i.Vars.Tick*i.Headers.BufLen
 		buf := make([]byte, i.Headers.BufLen)
@@ -227,9 +384,20 @@ func (i *IBT) Update(timeout time.Duration) (IRacingState, error) {
 
 		// Make this happen in a different thread, or have this send to a queue that has a thread
 		// writing to a file
-		_, err = i.FileToExport.WriteAt(buf, int64(start))
-		if err != nil {
-			log.Fatalf("Failed to write to file [1]: %v\n", err)
+		if i.Opts.IBTExport {
+			// Dirty attempt at getting this to work to write to a memory mapped file
+			switch i.Opts.IBTExportType {
+			case IBTFile:
+				err = i.exportIBT(buf, int64(start))
+				if err != nil {
+					log.Printf("Failed to export offline telemetry data: %v", err)
+				}
+			case SharedMemoryFile:
+				err = i.exportIBT(buf, int64(i.Headers.BufOffset))
+				if err != nil {
+					log.Printf("Failed to export live telemetry data: %v", err)
+				}
+			}
 		}
 
 		if err == io.EOF {

winutils/winutils_linux.go

@@ -1,53 +0,0 @@
-//go:build (linux && cgo) || (darwin && cgo)
-// +build linux,cgo darwin,cgo
-
-package winutils
-
-import (
-	"errors"
-	"sync"
-	"time"
-)
-
-const (
-	WAIT_OBJECT_0 = 0
-	WAIT_TIMEOUT  = 258
-)
-
-var (
-	once             sync.Once
-	ErrUnsupportedOS = errors.New("not found")
-)
-
-type utils struct {
-}
-
-// INITIALIZATION
-func newUtils() (*utils, error) {
-	return nil, ErrUnsupportedOS
-}
-
-func (u *utils) Close() {
-}
-
-// openEvent opens a windows.Handle for a given event
-func (u *utils) OpenEvent(eventName string) error {
-	return ErrUnsupportedOS
-}
-
-// OpenBroadcastChannel opens up a broadcast channel to send commands to iracing
-func (u *utils) OpenBroadcastChannel(name string) error {
-	return ErrUnsupportedOS
-}
-
-// INITIALIZATION
-
-// openEvent waits for a good response for some given time
-func (u *utils) CheckValidDataEvent(timeout time.Duration) bool {
-	return false
-}
-
-// SendBroadcastMessage sends a message trough the broadcast channel
-func (u *utils) SendBroadcastMessage(id, p1, p2 uintptr) error {
-  return ErrUnsupportedOS
-}